www.sefindia.org

STRUCTURAL ENGINEERING FORUM OF INDIA [SEFI]

 Forum SubscriptionsSubscriptions DigestDigest Preferences   FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups  RegisterRegister FAQSecurity Tips FAQDonate
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log in to websiteLog in to websiteLog in to websiteLog in to forum 
Warning: Make sure you scan the downloaded attachment with updated antivirus tools  before opening them. They may contain viruses.
Use online scanners
here and here to upload downloaded attachment to check for safety.

Time lag between casting of beams and slabs

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies.    www.sefindia.org Forum Index -> Past Discussions Year 2004
View previous topic :: View next topic  
Author Message
er_spsvasan
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 16

PostPosted: Sun Feb 08, 2004 3:03 pm    Post subject: Time lag between casting of beams and slabs Reply with quote

Hello everybody,

I just want to add two more points to the detailed discussion that has taken place.

1. Only "cold joints" are prohibited. i.e. joints made after the initial setting of first stage concrete and before the final set of first stage concreting.

2. In several of my projects I had to extend slabs which were even 15 to 20 years old. The joints between the old concrete and new concrete have behaved very well. Preparation of the surface of the existing concrete and compaction of the new concrete near the interface are far more important than the time lag. Ofcourse, if the time lag is small the secondary stresses due to differential shrinkage will be much smaller. Also, if the hydration of the existing concrete is still continuing, hydration products will form across the joint, adding to the integrity of the joint. Hence reduction in timelag between old and new concrete will result in a better joint.

Regards

S.P.Srinivasan

Posted via Email
Back to top
View user's profile Send private message
Display posts from previous:   
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies.    www.sefindia.org Forum Index -> Past Discussions Year 2004 All times are GMT
Page 1 of 1

 

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum


© 2003, 2008 SEFINDIA, Indian Domain Registration
Publishing or acceptance of an advertisement is neither a guarantee nor endorsement of the advertiser's product or service. advertisement policy